Patriots tight end Rob Gronkowski has fourth arm surgery

Patriots tight end Rob Gronkowski had a fourth surgery Monday to help repair the left forearm that he broke twice in the 2012 season, a league source confirmed.

A league source told the Globe that the procedure, performed by Dr. Jesse Jupiter, went well and it is believed the infection that has lingered for weeks is gone.

Another league source said there was “no obvious sign of infection,” and the expectation is Gronkowski will be ready for training camp.

Monday’s surgery was to replace the plate in Gronkowski’s forearm; assuming the infection has completely cleared, Gronkowski can begin his eight- to -10 week rehab process. Training camp will begin in about eight weeks.

Doctors won’t know for certain if the infection is gone for several days, after lab tests return.